Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Steel for non-magnetic drilling tool and production method thereof

A production method and technology for drilling tools, which are applied in the fields of forging and steelmaking, can solve the problems of reducing the solubility of nitrogen in steel, reducing the resistance to intergranular corrosion of steel, and other problems.

Inactive Publication Date: 2009-12-09
ZHONGYUAN SPECIAL STEEL
View PDF3 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems: if the amount of RE added is too large, it is easy to generate a large number of rare earth oxide inclusions in the steel, which reduces the plasticity and intergranular corrosion resistance of the steel; if the Si content is too high, the solubility of N in the steel will be reduced. Encourage the formation of δ ferrite, so that the relative magnetic permeability of the steel exceeds the standard; the Nb content is too high, and it is easy to form many strips and massive Nb carbon and nitride precipitation, and when the carbon content is high, the carbon and nitrogen in Nb Around the compound, the carbon and nitrogen compounds of Cr are precipitated, which reduces the intergranular corrosion resistance of steel
In this patent, the Nb content is not more than 0.35%, and the niobium in the examples is 0.29-0.32%. In this case, many strips and massive Nb carbons and nitrides will be precipitated, and Cr will be formed around the Nb carbons and nitrides. Precipitation of carbon and nitrogen compounds reduces the intergranular corrosion resistance of steel
The stainless steel produced by this patent is medium and high-nitrogen stainless steel. Its manufacturing process adopts electric furnace-LFV refining or electric furnace-AOD refining-LFV refining, but the vacuum refining in the later stage of smelting will reduce the solubility of nitrogen in the steel, resulting in A large amount of precipitation, so the smelting process is contradictory to the characteristics of the patented steel, which is not conducive to reducing costs and improving quality

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The technical scheme of the present invention is described below with specific examples, but protection scope of the present invention is not limited thereto:

[0047] Smelting non-magnetic stainless steel of the present invention (steel 1, steel 2, steel 3, steel 4) and comparative steel (comparative steel 1 and comparative steel 2) in the argon oxygen furnace, chemical composition is shown in Table 4, casts 3.5 tons of steel ingots, is heated to Open billet forging at 1080℃, billet forging ratio 5, forging into Φ280mm forgings, air cooling to deformation strengthening temperature, deformation strengthening, air cooling, air cooling or water cooling to room temperature after strengthening. Deformation strengthening process parameters and performance testing of forgings are shown in Table 5, and the meanings of the symbols in the table are:

[0048] Ni equivalent = Ni+0.60Mn+0.18Cr+9.69(C+N)-0.11Si 2 , when Ni equivalent ≥ 16, it is marked as √, when Ni equivalent < 16...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses steel for non-magnetic drilling tools and a production method thereof. The steel for non-magnetic drilling tools comprises the following chemical compositions in percentage by weight: Fe, less than or equal to 0.06% of C, 17.00-23.00% of Mn, less than or equal to 0.80% of Si, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 12.00-20.00% of Cr, less than or equal to 1.0% of Mo, 0.20-1.20% of N, less than or equal to 2.30% of Ni and less than or equal to 0.025% of Al, wherein, N equivalent weight=Ni+0.6Mn+0.18Cr+9.69(C+N)-0.11SI2 is greater than or equal to 16. Compared with the prior art, the invention provides an economic and scientific production method with stable austenite so as to be subject to use requirement, production cost requirement and the like. The steel for non-magnetic drilling tools of the invention is also suitable for other applicable fields.

Description

(1) Technical field [0001] The invention belongs to the technical field of steelmaking and forging, and in particular relates to a steel for non-magnetic drilling tools and a production method thereof. (2) Background technology [0002] The controllable directional drilling technology of oil production needs to precisely control the orientation of the borehole, which is usually positioned by a magnetic compass or other magnetic instruments. If ferromagnetic components are placed near these positioning instruments, the positioning will be disturbed. Therefore, in One or several non-magnetic drilling tools must be installed on each drill string to facilitate directional drilling. The purpose of configuring a non-magnetic drill collar near the position of the magnetic compass is not to provide a magnetic field-free environment for the magnetic compass, but to make the magnetic compass free from the influence of the close ferromagnetic drill string. If the magnetic compass is i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/38C22C33/04C21D7/00C22B9/18
Inventor 姚伟高宏生李海滨高全德李荣秀
Owner ZHONGYUAN SPECIAL STEEL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products